Background: Binucleation, defined as the presence of two nuclei within a single cytoplasm, is increasingly recognized as more than a non-specific cytological feature. Although it may occur under physiological or reactive conditions, its presence in cervical epithelial cells—particularly in the context of human papillomavirus (HPV) infection—often reflects underlying mitotic disruption, genomic instability, and evolving oncogenic stress.

Aim: This study aims to reframe binucleation as a graded biological biomarker of HPV-driven oncogenic stress and to establish an integrated cytomorphological–molecular framework linking binucleation with senescence, p16INK4a expression, micronuclei formation, and progression risk.

Methods: A comprehensive integrative review approach was employed, synthesizing cytomorphological, molecular, and mechanistic evidence related to HPV-associated cellular alterations. Key features—including binucleation, binucleation compression, micronuclei, nuclear atypia, chromatin abnormalities, and p16INK4a expression—were analyzed within a unified biological model. A stratified diagnostic framework and a semi-quantitative scoring system were developed to enable biological grading and risk stratification.

Results: High-risk HPV genotypes disrupt normal cell-cycle regulation through E6 and E7 oncoproteins, leading to checkpoint failure, centrosomal abnormalities, and defective cytokinesis, resulting in binucleation as an early structural manifestation of mitotic failure. Binucleation may precede classical cytopathic features such as koilocytosis and can be detected even in NILM cases, where it functions as an early biological signal, while in ASC-US it reinforces diagnostic interpretation.

The introduction of binucleation compression provides an additional level of diagnostic specificity by reflecting increased mitotic and mechanical stress. Binucleation is further associated with cellular senescence and p16INK4a overexpression, linking morphology with molecular dysregulation. As a dynamic intermediate state, binucleated cells may undergo senescence, apoptosis, mitotic catastrophe, or progress toward genomic instability. The presence of micronuclei reflects chromosomal missegregation and downstream DNA damage, and their coexistence with binucleation indicates compounded mitotic dysfunction and increased progression risk.

Conclusion and Recommendations: Binucleation should be interpreted not merely as a cytological feature but as a graded biological biomarker reflecting HPV-driven oncogenic stress, senescence-associated dysfunction, and genomic instability. The integration of binucleation, compression, micronuclei, and p16INK4a expression provides a robust framework for early detection, biological grading, and risk stratification. Implementation of the proposed scoring system and diagnostic model may enhance clinical decision-making, particularly in resource-limited settings, and warrants further validation in prospective 

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